That's not applicable here. I'm not drawing many many things before returning
to run loop so my memory usage isn't increasing due to repeated calls. It's
just this single image. Just for giggles I tried it anyway, and as expected
there's no difference at all.
--
Seth Willits
On Jan 16, 2011, at 5:32 AM, Jeff Johnson wrote:
> Hi Seth.
>
> You might want to try putting an autorelease pool around your method. See the
> "Tip" in this document:
>
> https://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/CoreImaging/ci_tasks/ci_tasks.html%23//apple_ref/doc/uid/TP30001185-CH203-TPXREF101
>
> I've used this tip before to fix what appeared to be a memory leak in my app.
>
> -Jeff
>
>
> On Jan 16, 2011, at 3:03 AM, Seth Willits wrote:
>
>> I have a CALayer subclass and I'm drawing into it using Core Image. I'm
>> taking a CGImage, blurring, and adding a darkened radial gradient on top of
>> it. Pretty simple. Now the weird thing is, using Core Image for drawing this
>> image (instead of just drawing with no effects using CGContextDrawImage)
>> increases my app's memory usage by 30 MB. That almost doubles the entire
>> usage of my app.
>>
>> It's not like I'm leaking any memory here, so why the large permanent
>> increase? I'd like to avoid it if I can because I'm getting criticized for
>> "using too much memory" despite it not being my fault. :-p
>>
>>
>>
>> - (void)drawInContext:(CGContextRef)theContext
>> {
>> CIImage * image = [CIImage
>> imageWithCGImage:(CGImageRef)self.backgroundImage];
>> CGRect imageRect = [image extent];
>>
>> CIFilter * blur = [CIFilter filterWithName:@"CIGaussianBlur"];
>> [blur setValue:image forKey:@"inputImage"];
>> [blur setValue:[NSNumber numberWithInt:2]
>> forKey:@"inputRadius"];
>>
>> CIFilter * gradient = [CIFilter
>> filterWithName:@"CIRadialGradient"];
>> CGPoint center = CGPointMake(CGRectGetMidX(imageRect),
>> CGRectGetMidY(imageRect));
>> [gradient setValue:[CIVector vectorWithX:center.x Y:center.y]
>> forKey:@"inputCenter"];
>> [gradient setValue:[NSNumber numberWithInt:0.0]
>> forKey:@"inputRadius0"];
>> [gradient setValue:[NSNumber numberWithInt:600.0]
>> forKey:@"inputRadius1"];
>> [gradient setValue:[CIColor colorWithRed:0.0 green:0.0 blue:0.0
>> alpha:0.3] forKey:@"inputColor0"];
>> [gradient setValue:[CIColor colorWithRed:0.0 green:0.0 blue:0.0
>> alpha:0.6] forKey:@"inputColor1"];
>>
>> CIContext * context = [CIContext
>> contextWithCGContext:theContext options:NULL];
>> CGRect extent = [image extent];
>> [context drawImage:[blur valueForKey:@"outputImage"]
>> inRect:self.bounds fromRect:extent];
>> [context drawImage:[gradient valueForKey:@"outputImage"]
>> inRect:self.bounds fromRect:extent];
>> }
>>
>>
>>
>> --
>> Seth Willits
>
>
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